Circumference and Area of Circles

Front

What is the radius of a circle?

Back

A line from the center point to the edge of the circle.

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = 2 × π × radius.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 7 cm, what is its circumference?

Back

43.98 cm.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

The distance from an edge of a circle to another edge through the center.

Front

What is the formula to calculate the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 cm, what is its area?

Back

78.54 cm².

Tags

CCSS.7.G.B.4

Front

What does π (pi) represent in circle calculations?

Back

The ratio of the circumference of a circle to its diameter, approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you find the circumference of a circle with a diameter of 10 cm?

Back

Circumference = π × diameter = 31.4 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

Diameter = 2 × radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 62.8 cm, what is its radius?

Back

10 cm.

Tags

CCSS.7.G.B.4